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Hematologist, oncohematologist

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Eosinophils

Alexey Kryvenko, medical expert
Last reviewed: 04.07.2025

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Eosinophils are cells that phagocytize Ag-AT complexes, represented mainly by IgE. After maturing in the bone marrow, eosinophils remain in the circulating blood for several hours (about 3-4), and then migrate to tissues, where their lifespan is 8-12 days. Eosinophils are characterized by a daily rhythm of fluctuations in the blood, the highest rates are noted at night, the lowest - during the day. The action of eosinophils is manifested in sensitized tissues. They are involved in immediate and delayed hypersensitivity reactions.

Reference values (norm) of absolute and relative content of eosinophils in the blood

Age	Absolute quantity, ×10 ⁹ /l	Relative quantity,%
12 months	0.05-0.7	1-5
4 years	0.02-0.7	1-5
10 years	0-0.60	1-5
21 years old	0-0.45	1-5
Adults	0-0.45	1-5

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What do need to examine?

Connective tissue

What tests are needed?

General blood test

Immunoglobulin E in the blood